/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.nifi.processors.huawei.abstractprocessor;

import com.huaweicloud.sdk.smn.v2.SmnClient;
import org.apache.nifi.annotation.lifecycle.OnScheduled;
import org.apache.nifi.components.ConfigVerificationResult;
import org.apache.nifi.logging.ComponentLog;
import org.apache.nifi.processor.*;
import org.apache.nifi.processor.exception.ProcessException;
import org.apache.nifi.processors.huawei.smn.SMNUtils;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;

public abstract class AbstractSMNProcessor extends AbstractHuaweiProcessor implements VerifiableProcessor {

    protected volatile SmnClient smnClient;

    @OnScheduled
    public void onScheduled(final ProcessContext context) {

        smnClient = SMNUtils.createClient(context);
    }

    @Override
    public List<ConfigVerificationResult> verify(final ProcessContext processContext, final ComponentLog componentLog, final Map<String, String> map) {

        final List<ConfigVerificationResult> results = new ArrayList<>();

        try {

            results.add(new ConfigVerificationResult.Builder()
                    .outcome(ConfigVerificationResult.Outcome.SUCCESSFUL)
                    .verificationStepName("Create Client and Configure Region")
                    .explanation("Successfully created SMN Client and configured Region")
                    .build());

        } catch (final Exception e) {

            componentLog.error("Failed to create SMN Client", e);
            results.add(new ConfigVerificationResult.Builder()
                    .outcome(ConfigVerificationResult.Outcome.FAILED)
                    .verificationStepName("Create Client and Configure Region")
                    .explanation("Failed to crete SMN Client or configure Region: " + e.getMessage())
                    .build());
        }

        return results;
    }

    public SmnClient getSmnClient() { return smnClient; }

    /*
     * Allow optional override of onTrigger with the ProcessSessionFactory where required for huawei processors
     *
     * @see AbstractProcessor
     */
    @Override
    public void onTrigger(final ProcessContext context, final ProcessSessionFactory sessionFactory) throws ProcessException {
        final ProcessSession session = sessionFactory.createSession();
        try {
            onTrigger(context, session);
            session.commitAsync();
        } catch (final Throwable t) {
            session.rollback(true);
            throw t;
        }
    }

    /*
     * Default to requiring the "standard" onTrigger with a single ProcessSession
     */
    public abstract void onTrigger(final ProcessContext context, final ProcessSession session) throws ProcessException;
}
